Momentus XL Iron Includes DVD with Drills and Instructions by Sean Cochran, Fitness Trainer on the PGA Tour. Resistance training blended with path and face angle training. The XL Iron gives you incredible resistance training both in your backswing and in your throughswing. The extreme size of the XL Iron's club face gives you the heightened visual awareness of the club face angle. The XL Iron forces you to keep the club face square thoughout the entire golf swing based on the physics of the design.